Wet thermal oxidation of AlxGa1−xAs compounds

Autor:	T. E. Schlesinger, R. S. Burton
Rok vydání:	1994
Předmět:	Thermal oxidation Materials science business.industry Inorganic chemistry Oxide Analytical chemistry General Physics and Astronomy Heterojunction Activation energy chemistry.chemical_compound Semiconductor Volume (thermodynamics) chemistry Limiting oxygen concentration Thermal stability business
Zdroj:	Journal of Applied Physics. 76:5503-5507
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.357169
Popis:	Results are presented on the wet thermal oxidation of AlxGa1−xAs. The growth of wet thermal oxides of AlxGa1−xAs is shown to be linear with time. An O2 carrier gas was found to form a self‐terminating oxide for compositions investigated (x≳0.4), but required elevated temperatures for substantial growth. The use of a medium oxygen concentration (∼20%) in a N2 carrier formed nonuniform oxides for all compositions investigated. A low O2 concentration (0.1%) in the N2 carrier was found to reduce the activation energy of the oxidation process for Al0.6Ga0.4As from 1.9 to 1.0 eV while increasing the activation energy of Al0.8Ga0.2As from 1.6 to 1.75 eV. For these wet thermal oxides it is observed that lateral oxidation at heterojunction interfaces is enhanced. This enhanced lateral oxidation can be attributed to local stress due to the smaller volume of the growing oxide compared to the volume of the consumed semiconductor.
Databáze:	OpenAIRE
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